Hi J D Perhaps I did misunderstood but if the hammer is to strike the string at a right angle it preculdes that the hammer shank will have to slightly overcenter & that the bore length will be slightly less than the String height minus the center pin height to achieve this. I'm assuming you may be hanging the hammers at a right angle to the shank. In order to hit an angled string plane with the hammer & have the string and hammer at right angles to each other ,somethings got to give. See what I mean? Perhaps sharing your boring protocol will clear up what your saying. Was mine unclear? SIncerely Dale Erwin JD wrote Broadly speaking I agree with Dale Erwin, as far as he goes, except that I aim to have each hammer strike the string at exactly a right angle. I don't follow the reasoning as regards over-centring. It might be argued that the shank bends under a heavy blow and therefore tends to cause the hammer head to under-centre slightly, but given the rigidity and thickness of modern shanks, particularly the hornbeam ones, I doubt if this is significant and would need to see a slow motion movie to be convinced. Nevertheless I think it would be a valid research exercise for someone with the equipment, if it hasn't already been done. -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20061011/6fd2ed36/attachment.html
This PTG archive page provided courtesy of Moy Piano Service, LLC